2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 7, 347-354
DOI 10.1007/s100529800996

Equilibrium and non-equilibrium hard thermal loop resummation
in the real time formalism

M.E. Carrington1 - H. Defu2 - M.H. Thoma3,4

1 Department of Physics, Brandon University, Brandon, Manitoba, R7A6A9 Canada
2 Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany
3 Institut für Theoretische Physik, Universität Giessen, D-35392 Giessen, Germany
4 European Center for Theoretical Studies in Nuclear Physics and Related Areas, Villa Tambosi, Strada delle Tabarelle 286, I-38050 Villazzano, Italy

Received: 9 April 1998 / Published online: 21 September 1998

Abstract
We investigate the use of the hard thermal loop (HTL) resummation technique in non-equilibrium field theory. We use the Keldysh representation of the real time formalism (RTF). We derive the HTL photon self energy and the resummed photon propagator. We show that no pinch singularities appear in the non-equilibrium HTL effective propagator. We discuss a possible regularization mechanism for these singularities at higher orders. As an example of the application of the HTL resummation method within the RTF we discuss the damping rate of a hard electron.


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